According to the lock-and-key model, the active site of an enzyme has a shape while the induced-fit model describes the active site as shape. According to the lock-and-key model, the active site of an enzyme has a shape while the induced-fit model describes the active site as shape. a. Rigid; nonflexibleb. Rigid and nonflexible; flexible or an adjustablec. Flexible or an adjustable shape; rigid and nonflexibled. Flexible; an adjustable shape

According to the given lock and key model the active site of an enzyme has a Rigid shape while the induced fit model describes the active site as Flexible shape.

Explanation:

Here the model being described is Lock and Key model.

Lock and Key model: In this model the enzyme behaves as Lock and the substrate is as a Key.

So, it mentions that only the right and correct key will fit in the enzyme's active site.

The active sites which are present consists of a specific substrate shape i.e. called as Rigid which only gets reacted with the substrate that perfectly fits into it.

Induced Fit Model: In this type of models enzymes are been considered as flexible and their is a partial role of substrate which determines the final outcome of the enzyme.

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answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.